zephyr/cmake/linker/lld/target_base.cmake

# SPDX-License-Identifier: Apache-2.0

# See root CMakeLists.txt for description and expectations of these macros

macro(toolchain_ld_base)
  # TOOLCHAIN_LD_FLAGS comes from compiler/clang/target.cmake
  # LINKERFLAGPREFIX comes from linker/lld/target.cmake
  zephyr_ld_options(
    ${TOOLCHAIN_LD_FLAGS}
  )

  zephyr_ld_options(
    ${LINKERFLAGPREFIX},--gc-sections
    ${LINKERFLAGPREFIX},--build-id=none
  )

  # Sort each input section by alignment.
  zephyr_ld_option_ifdef(
    CONFIG_LINKER_SORT_BY_ALIGNMENT
    ${LINKERFLAGPREFIX},--sort-section=alignment
  )

  if (NOT CONFIG_LINKER_USE_RELAX)
    zephyr_ld_options(
      ${LINKERFLAGPREFIX},--no-relax
    )
  endif()

  # Global pointer relaxation is off by default in lld. Explicitly enable it if
  # linker relaxations and gp usage are both allowed.
  if (CONFIG_LINKER_USE_RELAX AND CONFIG_RISCV_GP)
    zephyr_ld_options(
      ${LINKERFLAGPREFIX},--relax-gp
    )
  endif()

  if(CONFIG_CPP)
    # LLVM lld complains:
    #   error: section: init_array is not contiguous with other relro sections
    #
    # So do not create RELRO program header.
    zephyr_link_libraries(
      -Wl,-z,norelro
    )
  endif()

  if(CONFIG_LIBGCC_RTLIB)
    set(runtime_lib "libgcc")
  elseif(CONFIG_COMPILER_RT_RTLIB)
    set(runtime_lib "compiler_rt")
  endif()

  zephyr_link_libraries(
    --config ${ZEPHYR_BASE}/cmake/toolchain/llvm/clang_${runtime_lib}.cfg
  )
endmacro()